[ALPHA-STEP3] Update node initialization to use ZhtpIdentity::new_unified()

[umwelt]

Parent Milestone

Part of: #51 (Step 3: Runtime Integration)

Goal

Update zhtp node initialization to use ZhtpIdentity::new_unified() for identity creation.

Why

Ensures runtime uses the new unified identity system with deterministic NodeId derivation.

Dependencies

• Requires: [ALPHA MILESTONE] Step 2: Network Integration #50 (Step 2: Network Integration) complete

Tasks

• Update node startup code to call ZhtpIdentity::new_unified()
• Remove old identity creation methods
• Pass identity type, age, jurisdiction, device name to new_unified()
• Handle seed generation (new nodes) vs seed loading (existing nodes)
• Add error handling for identity creation failures
• Add logging for identity initialization

Files to Modify

• zhtp/src/runtime/mod.rs - Main runtime initialization
• zhtp/src/runtime/did_startup.rs - Identity startup logic

Acceptance Criteria

• Node initialization uses ZhtpIdentity::new_unified()
• Old identity creation methods removed
• Error handling in place
• cargo build --package zhtp succeeds
• Node starts successfully with new identity system

Priority

P0 - CRITICAL - Required for Step 3 completion

[thcsomebody]

Update node initialization.js

Updated identity initialization.js

Configuration updates.js